i use coco also.
from clone to veg i start out EC 0.8 and slowly increas it week by week to by flowering im up to 2.0 then i slowly increas it to 2.4 and in the last week i back in down to 1.2. u dnot flush at the end with coco caz u kill u wash away all the good bacteria in the medium
most important things.
-make sure you run to waste.
-when you feed make sure you get atleast 15-20% run off
-treat it as hydro, feed every 4 hours from lights on and they will really grow.
good luck